DESCRIPTIONS OF GENERA AND SPECIES. 213 



pairs of minute hairs on the lateral margins, not any 

 on the notogaster. 



The Legs are long, the first pair (fig. 9) nearly as 

 long as the whole body. This length is wholly in the 

 tarsus, which in each leg is as long as the other four 

 joints put together; but very much thinner and of 

 almost even thickness throughout ; a trifle the thinnest 

 about the middle, and increasing again a little at the 

 distal end, which is truncated. All the legs, except 

 the fourth, are terminated by a claw, the fourth by a 

 small point and a long hair. The first pair has also a 

 longish stalked caroncle or sucker. There is also a 

 single hair on the end of each tarsus outside the claw ; 

 this hair is the longest on the leg, except the tactile 

 hair on the front legs. The tactile hair, however, is 

 short for that hair. There are a pair of large, 

 thickened, almost spatulate hairs near the proximal 

 end of the tibia of the tirst leg ; a small pair of spines 

 about the middle of the tarsi, and a pair of short hairs 

 near the distal end of each tibia and genual of the two 

 front pairs of legs. The first and second legs are 

 usually stretched out and almost close together when 

 this hypopus is adhering to insects, etc., and the two 

 hind pairs doubled forward under the abdomen. 



Ventral Surface nearly flat ; epimera not joined to 

 sternum. Sucker-plate (fig. 8) broader than long, 

 straightish anteriorly, but with a central projection 

 and rounded corners, curved posteriorly ; just outside 

 it anteriorly is a pair of small suckers, one on each 

 side of the anus. The plate itself contains a pair of 

 suckers close together, and almost touching the anterior 

 edge of the plate ; then, further back, but touching the 

 first pair, is a transverse line of four suckers ; of which 

 the central pair is much the larger, and seems more 

 elaborately formed than the other suckers ; finally, 

 there is another pair of "small suckers almost touching 

 the hind margin of the plate, protected by a pair of 

 small spines. There are two or three pairs of small 

 hairs on the ventral surface. 



